DOI: 10.1007/s00382-012-1633-4
Scopus记录号: 2-s2.0-84884703020
论文题名: A mechanism for Atlantic multidecadal variability in the Kiel Climate Model
作者: Ba J. ; Keenlyside N.S. ; Park W. ; Latif M. ; Hawkins E. ; Ding H.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2013
卷: 41, 期: 2017-07-08 起始页码: 2133
结束页码: 2144
语种: 英语
英文关键词: AMO
; AMOC
; AMV
; Atlantic meridional overturning circulation
; Atlantic multidecadal variability
; Salinity
英文摘要: Atlantic Multidecadal Variability (AMV) is investigated in a millennial control simulation with the Kiel Climate Model (KCM), a coupled atmosphere-ocean-sea ice model. An oscillatory mode with approximately 60 years period and characteristics similar to observations is identified with the aid of three-dimensional temperature and salinity joint empirical orthogonal function analysis. The mode explains 30 % of variability on centennial and shorter timescales in the upper 2,000 m of the North Atlantic. It is associated with changes in the Atlantic Meridional Overturning Circulation (AMOC) of ±1-2 Sv and Atlantic Sea Surface Temperature (SST) of ±0.2 °C. AMV in KCM results from an out-of-phase interaction between horizontal and vertical ocean circulation, coupled through Irminger Sea convection. Wintertime convection in this region is mainly controlled by salinity anomalies transported by the Subpolar Gyre (SPG). Increased (decreased) dense water formation in this region leads to a stronger (weaker) AMOC after 15 years, and this in turn leads to a weaker (stronger) SPG after another 15 years. The key role of salinity variations in the subpolar North Atlantic for AMV is confirmed in a 1,000 year long simulation with salinity restored to model climatology: No low frequency variations in convection are simulated, and the 60 year mode of variability is absent. © 2012 Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54760
Appears in Collections: 过去全球变化的重建
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作者单位: GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Geophysical Institute and Bjerknes Centre, University of Bergen, Bergen, Norway; NCAS-Climate, Department of Meteorology, University of Reading, Reading, United Kingdom
Recommended Citation:
Ba J.,Keenlyside N.S.,Park W.,et al. A mechanism for Atlantic multidecadal variability in the Kiel Climate Model[J]. Climate Dynamics,2013-01-01,41(2017-07-08)